To test if your computer firewall is protecting you on the internet, see this post. Ubuntu installs a firewall when you install it to your computer. However, the firewall is not active. To activate the firewall, open a terminal window on your system, then enter the commands in italics as shown below: $ sudo ufw … Continue reading Firewall in Ubuntu Linux
If you are new to firewalls and want an easy way to build the rules for your devices, you can use Firewall Builder. It can be installed on Linux, Windows and other platforms. You can download it from http://www.fwbuilder.org. The key feature is an easy to use GUI-based firewall rules system. Firewall Builder can also … Continue reading Remove the pain from firewall rules building – Firewall Builder
# netstat -tupnl <enter> This command will show you all the open ports on your system.
You can test your firewall using Shields Up! at https://www.grc.com/x/ne.dll?bh0bkyd2. It lets you know if you have any ports open that are listening to connections.